Retaining coupler



FIG. 1 is a perspective view of a retaining coupler according to our new design, shown in a closed configuration holding a sensor and retaining shoe;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereto;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is an exploded perspective view thereof, shown in an open configuration;

FIG. 9 is a further exploded perspective view thereof, shown in an open configuration;

FIG. 10 is a perspective view thereof, shown in an open configuration;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereto;

FIG. 13 is a left side elevation view thereof;

FIG. 14 is a right side elevation view thereof;

FIG. 15 is a rear elevation view thereof; and,

FIG. 16 is a front elevation view thereof.

The broken lines immediately adjacent shaded areas represent bounds of the claimed design and environment while all other broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of the claimed design. 

CLAIM The ornamental design for a retaining coupler, as shown and described. 